EN
In connection with undertaking works on the physically based basin model it appeared indispensable organization of the special research basin. The fundamental task of the basin is collecting the data necessary for calibration as well as for verification of the integral model and its particular processes sub-models. In general the measurement data required for these purposes are not attainable in classic experimental and representative basins. Achievement of them requires organization of the special measurement programme. The experimental basin area is equal to 0,07 km². The stream is the right inflow of the Vistula River, 12 km downstream of Płock. In the paper have been described the basical research tasks of the basin, physiographic characteristics of its area and the measurement programme. In the basin have been selected two typical quasi-homogenous unit areas (in the piny forest and on the fallow area), which were used for the verification of the vertical water circulation model.